Art. 11. In the event of one of the Contracting Powers wishing to denounce the present Convention, the denunciation shall be notified in writing to the Netherlands Government, which shall at once communicate a duly certified copy of the notification to all the other Powers, informing them of the date on which it was received. The denunciation shall only have effect in regard to the notifying Power, and one year after the notification has reached the Netherlands Government.